Add a test for particle system to exist before working with it

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4486 dfc29bdd-3216-0410-991c-e03cc46cb475

examples/08.SpecialFX/main.cpp

@@ -165,6 +165,8 @@ int main()
 	scene::IParticleSystemSceneNode* ps =
 		smgr->addParticleSystemSceneNode(false);
 
+	if (ps)
+	{
 		scene::IParticleEmitter* em = ps->createBoxEmitter(
 			core::aabbox3d<f32>(-7,0,-7,7,1,7), // emitter size
 			core::vector3df(0.0f,0.06f,0.0f),   // initial direction
@@ -189,6 +191,7 @@ int main()
 		ps->setMaterialFlag(video::EMF_ZWRITE_ENABLE, false);
 		ps->setMaterialTexture(0, driver->getTexture("../../media/fire.bmp"));
 		ps->setMaterialType(video::EMT_TRANSPARENT_ADD_COLOR);
+	}
 
 	/*
 	Next we add a volumetric light node, which adds a glowing fake area light to